'69 turn signal auto cancel

[berch 69GMC]

The PO of my truck had a dangerous mix of steering parts just enough so I could test drive the truck. When disassembled, i found multiple pieces missing. After searching I am confused about what does the self canceling of turn signals. Anyone know if it was standard? If not, can I add it? In my haste i bought a forever sharp steering wheel, does the type of wheel effect the auto cancel? I have a new wiring and cam set up to install although the original is working well now, accept no auto cancel. I would like to install it all once, so if I need another part I would rather get it first. I see photos when I search of a white plastic piece with a protruding tube that I do not have in my column. Replies say to replace the inexpensive springs. Thanks